Up to version 2.6.28-11.42~ppa1 the linux-headers package was broken which broke external modules built manually or via dkms (nvidia, virtualbox). If you are experiencing problems with one of those modules please update to the latest package version and rebuild the modules. For modules built via dkms this can be done with:

The util-vserver package from intrepid seems to be broken (see: Ubuntu Bug), therefore I have rebuild the jaunty version for intrepid. This version ships with unstripped binaries due to another Ubuntu Bug.